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Issue 37, 2017
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Structure dependence of intramolecular electron transfer reactions of simple dyads of a zinc(II) porphyrin complex bearing a peripheral bipyridine moiety

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Abstract

New dyad systems based on a zinc(II) porphyrin complex and a 2,2′-bipyridine moiety linked by amide bridges having various bridging groups were synthesized. The photochemical behavior was investigated using fluorescence spectroscopy and a time-resolved absorption technique. The singlet excited state of the porphyrin complex was found to be partially quenched by Cu2+ in methanol, and a photoinduced electron transfer from the excited state of the porphyrin moiety to the Cu(II)-bipyridine moiety was observed using a transient absorption technique. The relatively long lifetime of the charge-separated state was ascribed to the slow electron-transfer reaction of the Cu(II)/Cu(I) couple bound to the bipyridine moiety. The lifetime of the charge-separated state of dyads becomes longer with the increase of the distance between the porphyrin and bipyridine moieties, and these findings are discussed using an empirical formula for the relationship between the reactivity and molecular structure of dyads.

Graphical abstract: Structure dependence of intramolecular electron transfer reactions of simple dyads of a zinc(ii) porphyrin complex bearing a peripheral bipyridine moiety

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Publication details

The article was received on 24 Jul 2017, accepted on 31 Aug 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02674A
Citation: Dalton Trans., 2017,46, 12645-12654
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    Structure dependence of intramolecular electron transfer reactions of simple dyads of a zinc(II) porphyrin complex bearing a peripheral bipyridine moiety

    K. Sakakibara, S. Nagino, H. Akanuma, Y. Tsukada, H. Nakano, T. Yagyu, H. D. Takagi and M. Inamo, Dalton Trans., 2017, 46, 12645
    DOI: 10.1039/C7DT02674A

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